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The funny thing is that the real Beer developed a password encryption and security system for a major software vendor, and he doesn't have to write books explaining mundane ten year old tech to prove it. He takes his gratitude in cold hard cash.

How do you know? Did you ever met him?

There is actually a form of authentication not requiring a RSA style public/private scheme you can implement which is unbreakable. But it's not cheap and it won't fall into the hands of GNU.